[MacPorts] #68683: gcc8+: doesn't work on macOS 10.6

[MacPorts]

#68683: gcc8+: doesn't work on macOS 10.6
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  Reporter:  catap                                   |      Owner:  (none)
      Type:  defect                                  |     Status:  new
  Priority:  Normal                                  |  Milestone:
 Component:  ports                                   |    Version:
Resolution:                                          |   Keywords:
      Port:  gcc8, gcc9, gcc10, gcc11, gcc12, gcc13  |
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Comment (by catap):

 Honeslty I don't think it is wise to add dependency from gcc to clang.

 The root cause of issue that behaviour of `/opt/local/bin/as` depends on
 which clang is installed. It is incinsistent and `ctools` should requires
 "some clang" and not "some LLVM" like it does right now.

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Ticket URL: <https://trac.macports.org/ticket/68683#comment:8>
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